Financial Information by Segment & Geographic Area - Revenue from External Customers and Long-Lived Asset Information by Geographic Area (Detail) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues from external customers	$ 619	$ 621	$ 568	$ 603	$ 671	$ 694	$ 694	$ 812	$ 2,411	$ 2,871	$ 3,647
Net property, plant and equipment	1,290				1,383				1,290	1,383	1,581
United States [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues from external customers									605	705	847
Net property, plant and equipment	490				480				490	480	496
China [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues from external customers									482	548	628
Net property, plant and equipment	266				311				266	311	355
The Netherlands [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues from external customers									162	176	220
Net property, plant and equipment	152				157				152	157	197
Other Foreign Countries [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues from external customers									1,162	1,442	1,952
Net property, plant and equipment	$ 382				$ 435				$ 382	$ 435	$ 533